One workspace for learning, practice, and review — every session funds verified carbon removal.
Free forever — no card required
Guided explanation, an interactive notepad, and practice that checks what stuck—not one-shot answers.
Explore topics in Learn, teach them back in Explain, or argue in Discuss. Hints and questions—not finished answers in one shot.
How Learn works →Sketch on a shared canvas. The assistant sees your work and nudges the next step—labels and diagrams on the page for collaborative practice.
How Notebook works →Generate quizzes on any topic—attach files to match your material—and get scored feedback on what landed.
How Review works →A new tree each month. Prompt as you study to grow it—past trees stay in your collection.
Mainstream chatbots burn fossil-heavy compute with every prompt. Bonsai runs on renewable power and funds verified carbon removal every time you prompt — 2× the carbon your usage emits on the free plan, about 10× on Pro, measured from your real token usage rather than estimated — so studying actively pulls carbon back out of the air.
Every prompt spins up fossil-fueled data centers at huge scale—adding emissions while nearby communities shoulder the burden.
Bonsai uses European data centers on renewable energy—not the fossil-heavy stack behind most LLMs.
Every prompt funds carbon removal—2× what it emitted on the free plan, about 10× on Pro—so studying pushes the planet forward.
Impact figures are averages. The full methodology — every constant, its source, and what we are still unsure about — is public.
Learn, notebook, review, and your garden—all free, for as long as you want them. Pro is $5/month—about the price of a coffee—for higher limits, our most capable model, and 10× your carbon removed instead of 2×.
No payment details required.
Upgrade from Account settings. Auto-renews until canceled.
Study to save the planet.
Bonsai